package cn.tedu.v3;

import java.io.*;
import java.net.BindException;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Map;
import java.util.Scanner;

/**
 * Version 3.0 升级  双向链接【客户端与服务器相互】
 * 优化空间
 */

public class Server {
    private ServerSocket serverSocket;
    private Map userDatabase;
    public Server() {
        try {
            serverSocket=new ServerSocket(4545);
        }catch(BindException e){
            System.out.println("端口号重复申请，建议换个端口号");
        }catch (IOException e) {
            System.out.println("申请端口号失败....");
        }
    }
    public void start(){
        try {
            while(true) {
                System.out.println("----等待客户端链接----");
                    Socket socket = serverSocket.accept();
                    String ip = socket.getInetAddress().getHostAddress();
                    System.out.println(ip + "客户端链接成功了");
                    new Thread(new CS(socket)).start();
            }
        } catch (IOException e) {
            System.out.println("服务器端通讯断开了");
        } finally {
            if(serverSocket!=null&&!serverSocket.isClosed()){
                try {
                    serverSocket.close();
                } catch (IOException e) {
                    System.out.println("服务器关闭失败");
                }
            }
        }
    }
    public static void main(String[] args){
        new Server().start();
    }
    private class CS implements Runnable{
        private Socket socket;
        private String ip;
        public CS(Socket s){
            this.socket=s;
            ip=socket.getInetAddress().getHostAddress();
        }
        public void run() {
            PrintWriter pw=null;
            //  BufferedReader br=null;
            try {
       //1.定义读入
       BufferedReader br=new BufferedReader(new InputStreamReader(socket.getInputStream(),"UTF8"));
       //2.定义写出
       pw=new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream(),"UTF8")),true);
       //1.1读入功能：存线程中
                new Thread(()->{
                    try {
                        String message;
                        while((message=br.readLine())!=null){
                            System.out.println("客户端说："+message);
                            //增加写出一句话：读完卡住等待输入
                            System.out.println("服务器端请输入：");
                        }
                    } catch (IOException e) {
                        System.out.println("客户端读入失败！");
                    }
                }).start();
       //2.1提供写方法：控制台输入
                Scanner input = new Scanner(System.in);//控制台卡住
                while (true){
                    System.out.println("服务器请输入：");
                    String say=input.nextLine(); //得到控制台输入值
                    //打印：服务器端说的文本---打印客户端
                   pw.println("服务器说："+say);
                }
            } catch (NullPointerException e) {
                System.out.println("IO流传入对象，有对象为null，立马核对建议：查看try块中的对象可能赋值为null");
            } catch (UnsupportedEncodingException e) {
                System.out.println("客户端或者服务器端：字符集不一致");
            } catch (IOException e) {
                System.out.println("通讯过程中，传输出现错误！");
            } finally {
              /**  if (br!= null)
                 try {
                    br.close();
                 }catch (IOException e) {
                     System.out.println("结束通讯，关闭失败！");
                 }*/
                if (socket != null && !socket.isClosed())
                    try {
                        socket.close();
                    } catch (IOException e) {
                        System.out.println("通讯关闭失败");
                    }
            }
        }
    }

}
